Hi,

Can the Ethernet Port on the DT85 be used to send a Modbus command to a TCP/IP Modbus Server Device (e.g. Sensor configured as TCP/IP Modbus Server) as well as receive a Modbus command from the TCP/IP Modbus Client Device (e.g. SCADA) simultaneously?

Thanks.
AJ

Hi Ajrai,

MODBUS communication in DT is available on both serial port and Ethernet port. If using serial port the popular name is MODBUS RTU while using Ethernet has a name of MODBUS TCP.

On using MODBUS TCP there is no specific Master Slave arrangement, the one which send a request would be Master and the one which receive a request would be Slave. So you can have dataTaker to read sensor through MODBUS TCP (as a Master) and being read by PLC using the same MODBUS TCP (as a Slave).

But you must pay attention on the timing and the interval of reading (sensor reading or PLC reading). It is recommended not to use a fast reading interval (i.e.: below 1 second) due to sequential process in the logger and non-synch timing with the PLC.

Best regards,
Rudy Gunawan